I took a WONDFO test strip this morning and was negative (PERIOD IN 6days)

Would I be better off taking the first response early result today or tomorrow morning? The strip I took this morning and it looks negative.. thinking because it required 25 miu for HCG and FR has an analytical 6.5 miu result, maybe I will have better luck with the FR. I’m 8DPO, and Ovia says to take a test in 4 days... but we all know how eager we can get! I just wanna know as early as possible! Can someone help me! If I take the FRER it wouldn’t be with FMU today.